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Niwa, Masakazu; Shimada, Koji; Sueoka, Shigeru; Ishihara, Takanori; Hakoiwa, Hiroaki; Asamori, Koichi; Murakami, Osamu; Fukuda, Shoma; Ogita, Yasuhiro; Kagami, Saya; et al.
JAEA-Research 2024-013, 65 Pages, 2024/11
JAEA-Research-2024-013.pdf:4.22MB
This annual report documents the progress of research and development (R&D) in the 2nd fiscal year of the JAEA 4th Medium- and Long-term Plan (fiscal years 2022-2028) to provide the scientific base for assessing geosphere stability for long-term isolation of high-level radioactive waste. The plan framework is structured into the following categories: (1) Development and systematization of investigation techniques, (2) Development of models for long-term estimation and effective assessment, (3) Development of dating techniques. The current status of R&D activities with previous scientific and technological progress is summarized.
Niwa, Masakazu; Shimada, Akiomi; Asamori, Koichi; Sueoka, Shigeru; Komatsu, Tetsuya; Nakajima, Toru; Ogata, Manabu; Uchida, Mao; Nishiyama, Nariaki; Tanaka, Kiriha; et al.
JAEA-Review 2024-035, 29 Pages, 2024/09
JAEA-Review-2024-035.pdf:1.24MB
This report is a plan of research and development (R&D) on geosphere stability for long-term isolation of high-level radioactive waste (HLW) in Japan Atomic Energy Agency (JAEA), in fiscal year 2024. The objectives and contents of this research are described in detail based on the JAEA 4th Medium- and Long-term Plan (fiscal years 2022-2028). In addition, the background of this research is described from the necessity and the significance for site investigation and safety assessment, and the past progress. The plan framework is structured into the following categories: (1) Development and systematization of investigation techniques, (2) Development of models for long-term estimation and effective assessment, (3) Development of dating techniques.
Ogata, Manabu; Komatsu, Tetsuya; Nakanishi, Toshimichi*
Earth, Planets and Space (Internet), 76, p.123_1 - 123_11, 2024/09
Times Cited Count：0 Percentile：0.00(Geosciences, Multidisciplinary)Marine terraces developed along the southeastern coast of Kii Peninsula, southwestern Japan, face a seismogenic region along the Nankai Trough. We determined the emergence age of one of these marine terraces by using feldspar OSL dating of the marine terrace sediments. The target marine terrace has previously been correlated with MIS 5e on the basis of morphostratigraphy. Samples for pIRIR dating were obtained from foreshore deposits of the marine terrace. pIRIR signals were measured at 150 
C (pIRIR
) and 225 C (pIRIR
). These results show that the surface of the marine terrace corresponds to MIS 5e rather than MIS 5c or 7, which is consistent with the chronological framework based on the morphological features of the terraces in this study area.
Niwa, Masakazu; Shimada, Koji; Sueoka, Shigeru; Fujita, Natsuko; Yokoyama, Tatsunori; Ogita, Yasuhiro; Fukuda, Shoma; Nakajima, Toru; Kagami, Saya; Ogata, Manabu; et al.
JAEA-Review 2023-017, 27 Pages, 2023/10
JAEA-Review-2023-017.pdf:0.94MB
This report is a plan of research and development (R&D) on geosphere stability for long-term isolation of high-level radioactive waste (HLW) in Japan Atomic Energy Agency (JAEA), in fiscal year 2023. The objectives and contents in fiscal year 2023 are described in detail based on the JAEA 4th Medium- and Long-term Plan (fiscal years 2022-2028). In addition, the background of this research is described from the necessity and the significance for site investigation and safety assessment, and the past progress. The plan framework is structured into the following categories: (1) Development and systematization of investigation techniques, (2) Development of models for long-term estimation and effective assessment, (3) Development of dating techniques.
Niwa, Masakazu; Shimada, Koji; Sueoka, Shigeru; Ishihara, Takanori; Ogawa, Hiroki; Hakoiwa, Hiroaki; Watanabe, Tsuyoshi; Nishiyama, Nariaki; Yokoyama, Tatsunori; Ogata, Manabu; et al.
JAEA-Research 2023-005, 78 Pages, 2023/10
JAEA-Research-2023-005.pdf:6.51MB
This annual report documents the progress of research and development (R&D) in the 1st fiscal year of the Japan Atomic Energy Agency 4th Medium- and Long-term Plan (fiscal years 2022-2028) to provide the scientific base for assessing geosphere stability for long-term isolation of high-level radioactive waste. The plan framework is structured into the following categories: (1) Development and systematization of investigation techniques, (2) Development of models for long-term estimation and effective assessment, (3) Development of dating techniques. The current status of R&D activities with previous scientific and technological progress is summarized.
Ogata, Manabu; King, G. E.*; Herman, F.*; Sueoka, Shigeru
Earth and Planetary Science Letters, 591, p.117607_1 - 117607_14, 2022/08
Times Cited Count：4 Percentile：37.91(Geochemistry & Geophysics)Optically stimulated luminescence (OSL)-thermometry can be used to reconstruct the thermal structure in slowly denuded regions where infrared stimulated luminescence (IRSL) signals of samples obtained from deep boreholes are measured and evaluated with depth. Until now, only one study has explored this approach, using a target mineral of Na-feldspar. In this study, we applied multi-OSL-thermometry to K-feldspar obtained from deep borehole core samples (MIZ-1) drilled at the Tono region, central Japan, which is a well-documented thermally stable crustal environment. The inverted temperature for the IRSL 50 C of the samples at a depth of 
1 km (40 C) were consistent with the in-situ temperature. The results suggest that the application of OSL-thermometry to K-feldspar in a borehole is useful to reconstruct the paleothermal condition.
Nakanishi, Toshimichi*; Komatsu, Tetsuya; Ogata, Manabu; Kawamura, Makoto; Yasue, Kenichi*
Gekkan Chikyu "Kiso deta Kara Kangaeru Dai Yonkigaku No Shintenkai-I" Gogai No.71, p.148 - 155, 2022/02
The formation process of terrace topography was investigated by observing and analyzing boring core samples collected in the middle reaches of the Kumano River. It was assumed that the older terrace topography was distributed higher than the current riverbed surface. However, since tributary debris flow deposits may be thickly distributed beneath the old gyre river valley, care must be taken when using the surface of the ground as an index of uplift and erosion.
Nakajima, Toru; Fukuda, Shoma; Ogata, Manabu; Sueoka, Shigeru
Fuisshon, Torakku Nyusureta, (34), p.25 - 26, 2021/12
The 17th International Conference on Thermochronology (Thermo2021) was held on September 12-17, 2021 at the Eldorado Resort in downtown Santa Fe, New Mexico, USA. Due to the social situation and the spread of the COVID-19, the event had been postponed. In this paper, I report on the circumstances surrounding our participation in the conference, the contents and trends of the presentations made at the conference, and the tasks for the 2023 and 2025 conferences.
Ogata, Manabu; Komatsu, Tetsuya; Nakanishi, Toshimichi
Dai Yonki Kenkyu, 60(2), p.27 - 41, 2021/06
no abstracts in English
Ogata, Manabu; Sueoka, Shigeru
Radioisotopes, 70(3), p.159 - 172, 2021/03
no abstracts in English
Tsukahara, Yuzuko; Ogata, Manabu; Kawamura, Makoto; Kanno, Mizuho*; Nishiyama, Nariaki; Sueoka, Shigeru; Nakanishi, Toshimichi*; Komatsu, Tetsuya
no journal, ,
One hundred thousand-year-scale uplift rate of the Japanese mountains is estimated mainly based on the Terrace to Terrace method (TT method; Yoshiyama and Yanagida, 1995). To apply the TT method, it is necessary to identify the pair of the sedimentary terraces of the last glacial period and the one before last glacial period. However, there are many mountains where such terrace pairs are not recognized. Therefore, as an alternative method to the TT method, we suggest the method based on landforms and deposits of incised meandering rivers (for example, Yasue et al., 2014; Ogata et al., 2021). In this presentation, we will report the results of a survey conducted in the middle of the Oi River as part of such research.
King, G.*; Bartz, M.*; Bossin, L.*; Wen, X.*; Tsukamoto, Sumiko*; Herman, F.*; Ogata, Manabu; Sueoka, Shigeru
no journal, ,
Ogata, Manabu; King, G. E.*; Herman, F.*; Sueoka, Shigeru
no journal, ,
no abstracts in English
Tanaka, Kiriha; Ogata, Manabu; Tsukahara, Yuzuko; Nishiyama, Nariaki
no journal, ,
Electron spin resonance (ESR) dating of a quaternary sediment is a technology with the potential to directly determine the age of the last sedimentation. This method assumes that charges trapped in defects (trapped charges) in quartz in a sediment have been released by sunlight exposure (optically bleaching) during processes of erosion, transportation, and/or sedimentation, then trapped charges are accumulated by natural radiation during a process of burial. A sediment which has exposed to sunlight during a burial process must avoid being used for ESR dating, because its depositional age is underestimated. Thus, sediment under 
cm depth from an outcrop surface in strike direction, which is not exposed to sunlight, is conventionally used for ESR dating. However, the correct depth to be remove is not clearly demonstrated and unchecked each time. Therefore, it is crucial to reveal the effect of sunlight exposure on trapped charges detected by ESR measurements in a surface layer of an outcrop. In this study, silty aeolian loam and silt to fine marine sand samples were collected with poly vinyl chloride pipes with a diameter of 4 cm and a length of 35 cm from a terrace deposit located at the altitude of 30-33 m in Nanao-shi, Ishikawa prefecture. The loam and marine sand samples were cut into three and seven pieces, respectively. Quartz grains isolated by chemical processing were used for ESR measurements. For the loam sample, ESR intensity for the E
' center remained constant regardless of depth in the strike direction. Whereas ESR intensities for the Al and Ti center at depths of 20 and 30 cm were greater than that at a depth of 10 cm, respectively. For the marine sand sample, ESR intensities for all the trapped charges at depths of 3-14, and 33 cm were approximately equal, whereas the intensities were greater than those at depth of 20-30 cm.
Terada, Tatsuya*; Nishiyama, Nariaki; Komatsu, Tetsuya; Uchida, Mao; Ogata, Manabu; Ishihara, Takanori; Kawamura, Makoto; Nakanishi, Toshimichi*
no journal, ,
no abstracts in English
Sueoka, Shigeru; Komatsu, Tetsuya; Ogata, Manabu; Fukuda, Shoma; Nakajima, Toru; Nishiyama, Nariaki; Tsukahara, Yuzuko; Uchida, Mao; Kawamura, Makoto
no journal, ,
no abstracts in English
King, G. E.*; Bossin, L.*; Kranz-Bartz, M.*; Wen, X.*; Schmidt, C.*; Herman, F.*; Ogata, Manabu; Sueoka, Shigeru
no journal, ,
Nakanishi, Toshimichi; Komatsu, Tetsuya; Ogata, Manabu
no journal, ,
no abstracts in English
ne valley incision?King, G. E.*; Wen, X.*; Bartz, M.*; Anderson, L.*; Bossin, L.*; Tsukamoto, Sumiko*; Li, Y.*; Herman, F.*; Ogata, Manabu; Sueoka, Shigeru
no journal, ,
King, G. E.*; Wen, X.*; Bartz, M.*; Bossin, L.*; Tsukamoto, Sumiko*; Li, Y.*; Herman, F.*; Ogata, Manabu; Sueoka, Shigeru
no journal, ,
